1. Gove PB (1981) Webster’s Third International Dictionary of the English Language Unabridged. Merriam Co, Springfield MA.
2. Aristoteles of Stagira: On the generation of animals. Translated by Peck AL (1963) London, Cambridge MA.
3. Leonardo da Vinci, Quaderni di Anatomia. Cited by Castiglioni A (1948) Storia della Medicina Vol 1. Mondadori, Milano, p 363.
4. Medici M (1836) Manuale di Fisiologia. Tesi e Wambergher, Livorno, p 534.
5. Ward WK, Johnston CLW, Beard JC, Benedetti TG, Halter JB, Porte D Jr (1985) Insulin resistance and impaired insulin secretion in subjects with histories of gestational diabetes mellitus. Diabetes 34: 861 – 869.